What is a cost? What is an expense?

Transcription

1 What is a cost? What is an expense? A cost is a sacrifice of resources. An expense is a cost incurred in the process of generating revenues. Expenses are recorded at the same time that the associated revenues occur, regardless of when the sacrifice of resources occurs. (Matching Principle) Expenses are relevant for financial accounting; costs are relevant for management accounting. The only difference is timing. Expenses are matched to revenues. Costs are recorded whenever deemed appropriate by management.

2 Cost/expense example A company buys a machine for $10 million. It uses the machine for 4 years to produce memory chips. Revenues occur for 4 years, so expenses are recorded (as depreciation) over the 4 years of production at $2.5 million per year. For the purpose of determining the cost of producing each chip, the firm spreads the cost over the production life (8 million chips) and allocates $10 million / 8 million chips = $1.25 per chip. For the purpose of determining whether to buy the machine in the first place, the company is interested in net present value of cash flow revenues and costs, so it records the entire $10 million as a cost on the date of purchase.

4 Outlay vs. opportunity costs Outlay cost: involves an actual expenditure of cash Opportunity cost: involves a sacrifice of potential revenue. Opportunity costs arise when the firm has scarce resources that can be used in different productive ways. Using these resources in one way, prevents the firm from alternative uses, sacrificing alternative revenue streams. Example A beer manufacturer owns a bottling machine that can be run 20 hours per day (4 hours are required for daily maintenance). This machine can be used to bottle regular or light beer, but not both at the same time. If the firm uses the machine for the entire 20 hours to bottle light beer, it cannot bottle any regular beer. In this case, the firm loses potential regular beer sales, generating an opportunity cost. Similarly, if the firm uses the machine to bottle regular beer, it incurs an opportunity cost on lost sales of light beer.

5 Differential vs. sunk cost Differential cost: a cost that changes if you change some decision. Sunk cost: a cost that remains constant if you change some decision. Differential and sunk costs depend on the particular decision under consideration. A differential cost in one context could be a sunk cost in another context. Only differential costs are relevant to decision making. Example A firm has a branch office in Missouri. The firm is thinking about closing the office. If it does, then it can lay off its employees in the office, but it must continue to pay rent under a long-term lease. The employee salaries are differential costs. The rent on the office is a sunk cost.

6 Fixed/variable/mixed/step costs Fixed cost: a cost that does not change when production volume changes. Variable cost: a cost that changes in proportion to production volume. Mixed cost: a combination of a fixed and a variable cost. Cost is a linear function of production volume with a positive slope and intercept. Step cost: a cost that increases in steps as production volume changes. Examples Fixed cost: CEO salary Variable cost: wages of assembly line workers Mixed cost: electricity bill Step cost: cost of a machine that can produce 10,000 units of output per day. Step costs are in between fixed and variable costs. At low volumes, they act as fixed costs. At high volumes, they act as variable costs.

7 Direct/indirect/overhead costs Cost object: something that generates costs in a firm, such as a product or a department. Direct cost: a cost that can be directly attributed to a specific cost object. Indirect cost: a cost that cannot be directly attributed to a specific cost object. Overhead: all costs except direct labor and materials. Note that whether or not a cost is direct depends on the accounting system. A detailed accounting system can trace more costs than a simple accounting system, but at greater administration cost. Indirect costs must be allocated to cost objects in some arbitrary manner. Direct costs need not be allocated since they can be directly attributed to cost objects.

8 Product/period costs Product costs: costs that can be associated with products. Period costs: costs that can be associated with time periods. Full absorption cost: a measure of product costs that includes any cost associated with manufacturing and excludes any cost associated with marketing or general administration. Full absorption cost is required for financial reporting. It is used to value inventory and to determine cost of goods sold. Any measure of product/period cost is permissible for management accounting. For example, a firm could measure product costs as only those manufacturing costs that vary with the level of production. Thus, only variable manufacturing costs (and possibly some step costs) would be included.

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